<!doctype html>
<html ng-app>
<head>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.min.js"></script>
</head>
<body>
<div ng-controller="CountController">
    {{count}}
    <button ng-click="count=3">Count Three</button>
    <button ng-click='setCount()'>Set count to three</button>
</div>
<script>
    function CountController($scope) {
        $scope.setCount = function () {
            $scope.count = 3;
        };
    }
</script>
</body>
</html>
